I think you're right on all points. Unfortunately there's not many other people doing any of this stuff.

MightyBytes and WholegrainDigital, seem to be the leaders in this space.

Which is why I'll be sending them a long, annoying list of things I think can be improved.

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the idea of the MozLink thing is that you reduce the number of clicks it takes to find your website — and so reducing the number of requests made to servers.

It's not a very good metric.